[crankshaft] Remove the useless HCallStub instruction.

src/crankshaft/hydrogen-instructions.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_CRANKSHAFT_HYDROGEN_INSTRUCTIONS_H_
 #define V8_CRANKSHAFT_HYDROGEN_INSTRUCTIONS_H_
 
 #include <cstring>
 #include <iosfwd>
 
@@ skipping 46 matching lines @@
   V(Bitwise)                                  \
   V(BlockEntry)                               \
   V(BoundsCheck)                              \
   V(BoundsCheckBaseIndexInformation)          \
   V(Branch)                                   \
   V(CallWithDescriptor)                       \
   V(CallJSFunction)                           \
   V(CallFunction)                             \
   V(CallNewArray)                             \
   V(CallRuntime)                              \
-  V(CallStub)                                 \
   V(CapturedObject)                           \
   V(Change)                                   \
   V(CheckArrayBufferNotNeutered)              \
   V(CheckHeapObject)                          \
   V(CheckInstanceType)                        \
   V(CheckMaps)                                \
   V(CheckMapValue)                            \
   V(CheckSmi)                                 \
   V(CheckValue)                               \
   V(ClampToUint8)                             \
@@ skipping 5150 matching lines @@
       : index_(index),
         kind_(kind) {
     set_representation(r);
   }
 
   unsigned index_;
   ParameterKind kind_;
 };
 
 
-class HCallStub final : public HUnaryCall {
- public:
-  DECLARE_INSTRUCTION_WITH_CONTEXT_FACTORY_P2(HCallStub, CodeStub::Major, int);
-  CodeStub::Major major_key() { return major_key_; }
-
-  HValue* context() { return value(); }
-
-  std::ostream& PrintDataTo(std::ostream& os) const override;  // NOLINT
-
-  DECLARE_CONCRETE_INSTRUCTION(CallStub)
-
- private:
-  HCallStub(HValue* context, CodeStub::Major major_key, int argument_count)
-      : HUnaryCall(context, argument_count),
-        major_key_(major_key) {
-  }
-
-  CodeStub::Major major_key_;
-};
-
-
 class HUnknownOSRValue final : public HTemplateInstruction<0> {
  public:
   DECLARE_INSTRUCTION_FACTORY_P2(HUnknownOSRValue, HEnvironment*, int);
 
   std::ostream& PrintDataTo(std::ostream& os) const override;  // NOLINT
 
   Representation RequiredInputRepresentation(int index) override {
     return Representation::None();
   }
 
@@ skipping 2452 matching lines @@
 
 
 
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CRANKSHAFT_HYDROGEN_INSTRUCTIONS_H_